Various aspects of the relationship between ethical climate types and organizational commitment have been examined, although a relationship with the concept of bullying, which may be very detrimental to an organization, has not attracted significant attention. This study contributes to the existing research by taking the effects of bullying behaviour into consideration. The aim of this study is to explore the effects of bullying behaviour upon the relationship between ethical climate types and organizational commitment. It will be noted that work-related bullying behaviour significantly mediated the relationship between instrumentality climate and two of the dimensions of organizational commitment. Significant relationships between ethical climate dimensions and organizational commitment can also be detected. By emphasizing a required ethical climate dimension for organizations this study therefore presents in outline a partial strategy to reduce bullying behaviour and to increase organizational commitment.